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1_The Human Ear
- The Inner ear
- semicircular canals (anterior, posterior, lateral);embedded in temporal bone; three separate loops;
contain clear, watery liquid. Its function is that hair cells within canals perceive sense of balance and
position in space; fluid flows in certain directions when you move your head; different movements
affect different canals; aids in maintaining balance and has nothing to do with hearing.
- Cochlea: a boney, spiral-shaped cavity coiled 2 ½ times; filled with fluid and divided into
three sections; pea-sized; houses organ of Corti. Its function is that it converts stimulus
from outside environment into nerve impluses for transmission to the brain.
- Lower Channel
- Middle Channel
- Upper channel
- Organ of Corti: center of cochlea; contains 15000 to 20000 microscopic
hairs which, when displaced by fluid movement, are the hydromechancal
energy.
- Basilar membrane: divides cochlea lengthwise;
final destination for vibrations that enter the
ear, vibrate in same pattern as sound waves
- semicircular canals (anterior, posterior, lateral);embedded in temporal bone; three separate loops;
contain clear, watery liquid. Its function is that hair cells within canals perceive sense of balance and
position in space; fluid flows in certain directions when you move your head; different movements
affect different canals; aids in maintaining balance and has nothing to do with hearing.
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